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1 // f-fsolve.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include "NLEqn.h" |
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29 |
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30 #include "tree-const.h" |
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31 #include "variables.h" |
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32 #include "gripes.h" |
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33 #include "error.h" |
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34 #include "utils.h" |
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35 #include "f-fsolve.h" |
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36 |
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37 // Global pointer for user defined function required by hybrd1. |
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38 static tree *fsolve_fcn; |
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39 |
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40 #ifdef WITH_DLD |
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41 tree_constant * |
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162
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42 builtin_fsolve (const tree_constant *args, int nargin, int nargout) |
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43 { |
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44 return fsolve (args, nargin, nargout); |
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45 } |
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46 #endif |
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47 |
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48 int |
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49 hybrd_info_to_fsolve_info (int info) |
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50 { |
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51 switch (info) |
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52 { |
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252
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53 case -1: |
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54 info = -2; |
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55 break; |
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56 case 0: |
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57 info = -1; |
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58 break; |
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59 case 1: |
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60 break; |
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61 case 2: |
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62 info = 4; |
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63 break; |
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64 case 3: |
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65 case 4: |
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66 case 5: |
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67 info = 3; |
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68 break; |
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69 default: |
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70 panic_impossible (); |
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71 break; |
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72 } |
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73 return info; |
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74 } |
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75 |
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76 ColumnVector |
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77 fsolve_user_function (const ColumnVector& x) |
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78 { |
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79 ColumnVector retval; |
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80 |
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81 int n = x.capacity (); |
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82 |
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83 // tree_constant name = tree_constant (fsolve_fcn->name ()); |
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84 tree_constant *args = new tree_constant [2]; |
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85 // args[0] = name; |
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86 |
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87 if (n > 1) |
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88 { |
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89 Matrix m (n, 1); |
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90 for (int i = 0; i < n; i++) |
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91 m (i, 0) = x.elem (i); |
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92 tree_constant vars (m); |
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93 args[1] = vars; |
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94 } |
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95 else |
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96 { |
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97 double d = x.elem (0); |
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98 tree_constant vars (d); |
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99 args[1] = vars; |
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100 } |
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101 |
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102 if (fsolve_fcn != NULL_TREE) |
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103 { |
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104 tree_constant *tmp = fsolve_fcn->eval (args, 2, 1, 0); |
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105 delete [] args; |
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106 if (tmp != NULL_TREE_CONST && tmp[0].is_defined ()) |
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107 { |
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108 retval = tmp[0].to_vector (); |
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109 |
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110 delete [] tmp; |
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111 |
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112 if (retval.length () <= 0) |
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113 gripe_user_supplied_eval ("fsolve"); |
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114 } |
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115 else |
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116 { |
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117 delete [] tmp; |
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118 gripe_user_supplied_eval ("fsolve"); |
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119 } |
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120 } |
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121 |
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122 return retval; |
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123 } |
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124 |
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125 tree_constant * |
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126 fsolve (const tree_constant *args, int nargin, int nargout) |
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127 { |
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128 // Assumes that we have been given the correct number of arguments. |
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129 |
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130 tree_constant *retval = NULL_TREE_CONST; |
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131 |
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132 fsolve_fcn = is_valid_function (args[1], "fsolve", 1); |
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133 if (fsolve_fcn == NULL_TREE |
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134 || takes_correct_nargs (fsolve_fcn, 2, "fsolve", 1) != 1) |
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135 return retval; |
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136 |
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137 ColumnVector x = args[2].to_vector (); |
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138 |
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139 if (nargin > 3) |
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140 warning ("fsolve: ignoring optional arguments"); |
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141 |
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142 if (nargout > 2) |
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143 warning ("fsolve: can't compute path output yet"); |
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144 |
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145 NLFunc foo_fcn (fsolve_user_function); |
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146 NLEqn foo (x, foo_fcn); |
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147 |
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148 int info; |
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149 ColumnVector soln = foo.solve (info); |
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150 |
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151 info = hybrd_info_to_fsolve_info (info); |
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152 |
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153 retval = new tree_constant [nargout+1]; |
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154 retval[0] = tree_constant (soln, 1); |
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155 |
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156 if (nargout > 1) |
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157 retval[1] = tree_constant ((double) info); |
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158 |
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159 if (nargout > 2) |
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160 retval[2] = tree_constant (); |
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161 |
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162 return retval; |
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163 } |
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164 |
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165 /* |
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166 ;;; Local Variables: *** |
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167 ;;; mode: C++ *** |
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168 ;;; page-delimiter: "^/\\*" *** |
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169 ;;; End: *** |
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170 */ |
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171 |
